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Well-kept secrets of the right hemisphere

A carotid amytal study of restricted memory transfer

Department of Psychology, State University of New York at Stony Brook, Stony Brook, New York.

Verbal and nonverbal recall of a simple tactual stimulus was assessed in patients receiving left intracarotid injections of sodim amytal. During the period of dominant hemisphere anesthetization, a common object was presented to the left hand-right hemisphere but was kept out of view. Following recovery from the drug, six of the eight patients were unable to recall the object verbally, but recognized it immediately in a visual multiple-choice array. These results demonstrate a dissociation of verbal and nonverbal memory mechanisms which suggests that delayed interhemispheric transfer of a functional sensory message is highly improbable.

Dr. Risse's address is Aphasia Unit, Hennepin County Medical Center, Minneapolis, MN 55415.

This study was supported in part by USPHS Grant No. MH25643.

Presented in part at the twenty-eighth annual meeting of the American Academy of Neurology, Toronto, 1976.

Accepted for publication July 20, 1977.

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